So, now i'm really confused on front over-riders/bumperettes.
According to the BMW parts book, and, of course, my understanding of it, the "early" ones in Mike's picture were fitted on all models up to modell '71 & VINs 2585136, 2533172 & 2760629.
The ones I pictured were fitted from model '71 onwards in Europe and up to late '73 in USA when the big bumpers arrived. ie from VINs 2585137, 2533173 & 2760630.
However, there were two "upright" versions also thrown into the mix.
Version 1 available for Euro 1602/1600ti/1600-2 cab/2002/2002A/2002ti & USA 1602/1802/2002/2002A up to modell '71
Version 2 available for Euro 1502/1802/2002/2002cab/2002A/2002tii and all Touring models & USA 1602/2002/2002A/2002tii from modell '71.
The only thing I can find unique about the USA '73 model '02s is the bumper support bars and maybe some additional fixings for it.
edit: ok - although the parts book says the earlier ones up to modell '71, the 2585136 & 2533172 are right at the end of the '72 models, however, the 2760629 is part way thru' '72!!!